I think you're discussing Presidential impeachment, answer is both houses of Congress. House of Representatives actually 'impeaches' the President (essentially charging him or her) and the Senate holds the trial and if convicted, the President is removed from office. The Vice President can also be impeached as well as officers of the United States. Technically, the term impeachment is mis-used, but it has been mis-used so often, it essentially refers to the involuntary removal of the president.
The US Senate holds the trial for any impeached federal official .
The U.S. Senate has the sole power to try an official who has been impeached by the House of Representatives.
the president person
the house of representatives has the power of impeachment and the senate has the sole power to try an impeached officer
Senate
The trial of an impeached official (President, Vice President, cabinet official, member of Congress, or Federal judge) would take place in the US Senate.
The US Senate tries government officials who have been impeached by the House of Representatives, and may remove them from office if they find just cause.
The Senate tries federal office holders who have been impeached by the House.
House of Representatives
They see what the public official has done to be impeached
house of representatives
Impeachment is a political process that begins when an official is accused of engaging in illegal behavior (such as bribery or treason) and could potentially be stripped of their office or face another punishment. The specifics of the impeachment process varies from country to country. In the United States of America, both federal and state officials can be impeached. For federal officials, a majority of the U.S. House of Representatives must approve the accusation(s) being made against the official. Then, the U.S. Senate will try the accused. If two-thirds of senators present believe that the accused official is guilty, then the official will be impeached. The Constitution of the United States does not specify who should be in charge of the impeachment process, but historically, the Vice-President or an official presiding over the Senate has assumed this position. If the President of the United States is being impeached, the Chief Justice of the United States Supreme Court is in charge of the process.
The US Senate tries government officials who have been impeached by the House of Representatives, and may remove them from office if they find just cause.
Any president can be impeached if the circumstances warrant it. However, only the US House of Representatives can impeach a US President. [Article I, section 2, paragraph 5, clause 2] Once a President has been impeached (accused), then the Senate would try that President. If and only if two thirds of the Senators voted guilty would that President be removed from office. [Article I, section 3, paragraph 6] For more, please feel free to view a transcript of the Constitution of the United States of America. Click on the link to the website of the National Archives under Related Links. But it should be noted that President Obama has a very high satisfaction rate among US citizens and has been elected to the presidency for a second term; thus, it is doubtful that he would be impeached, even if his political opponents wish it would happen.